I would not go as far to say that Nin can be unforgiving too.
Mundras if messed up are either the player, or if you do get lag sometimes after a keypress and it does not register or appear to the player will reapply same action because of it and therefore mundra gets messed up. So it's kind of a yes and no situation for that part.
Also if as dragoon you are not in the certain position, dps loss is far more noticeable. Dancing Edge is pretty much the only attack that is positional for Nin.